1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * Minor number allocation for various protocol modules. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/kmem.h> 34 #include <sys/mutex.h> 35 #include <sys/ddi.h> 36 #include <sys/types.h> 37 #include <sys/mkdev.h> 38 #include <sys/param.h> 39 #include <inet/common.h> 40 41 typedef struct inet_arena { 42 vmem_t *ineta_arena; /* Minor number arena */ 43 minor_t ineta_maxminor; /* max minor number in the arena */ 44 } inet_arena_t; 45 46 void * 47 inet_minor_create(char *name, dev_t min_dev, dev_t max_dev, int kmflags) 48 { 49 inet_arena_t *arena = kmem_alloc(sizeof (inet_arena_t), kmflags); 50 51 if (arena != NULL) { 52 arena->ineta_maxminor = max_dev; 53 arena->ineta_arena = vmem_create(name, 54 (void *)min_dev, arena->ineta_maxminor - min_dev + 1, 55 1, NULL, NULL, NULL, 1, kmflags | VMC_IDENTIFIER); 56 57 if (arena->ineta_arena == NULL) { 58 kmem_free(arena, sizeof (inet_arena_t)); 59 arena = NULL; 60 } 61 } 62 63 return (arena); 64 } 65 66 void 67 inet_minor_destroy(void *a) 68 { 69 inet_arena_t *arena = (inet_arena_t *)a; 70 71 if (arena != NULL) { 72 vmem_destroy(arena->ineta_arena); 73 kmem_free(arena, sizeof (inet_arena_t)); 74 } 75 } 76 77 dev_t 78 inet_minor_alloc(void *arena) 79 { 80 return ((dev_t)vmem_alloc(((inet_arena_t *)arena)->ineta_arena, 81 1, VM_NOSLEEP)); 82 } 83 84 void 85 inet_minor_free(void *arena, dev_t dev) 86 { 87 ASSERT((dev != OPENFAIL) && (dev != 0) && (dev <= MAXMIN)); 88 vmem_free(((inet_arena_t *)arena)->ineta_arena, (void *)dev, 1); 89 } 90 91 /* 92 * This function is used to free a message that has gone through 93 * mi_copyin processing which modifies the M_IOCTL mblk's b_next 94 * and b_prev pointers. We use this function to set b_next/b_prev 95 * to NULL and free them. 96 */ 97 void 98 inet_freemsg(mblk_t *mp) 99 { 100 mblk_t *bp = mp; 101 102 for (; bp != NULL; bp = bp->b_cont) { 103 bp->b_prev = NULL; 104 bp->b_next = NULL; 105 } 106 freemsg(mp); 107 } 108